Initiator composition for fluorinated polymer and method for producing fluorinated polymer

Abstract

To provide a polymerization initiator composition for a fluorinated polymer which will not destroy ozone layer and which has less influence over polymerization of a monomer for a fluorinated polymer, and a method for producing a fluorinated polymer by which a fluorinated polymer having a sufficient molecular weight can be obtained. An initiator composition for a fluorinated polymer, which comprises an organic peroxide, and a saturated hydrocarbon compound having at least one tertiary or quaternary carbon atom, and a method for producing a fluorinated polymer using the polymerization initiator composition, and a polymerization method comprising a step of recovering a polymerization solvent and a step of separating the saturated hydrocarbon compound from the recovered polymerization solvent.

What is claimed is: 
     
         1 . An initiator composition for a fluorinated polymer, which comprises an organic peroxide, and a saturated hydrocarbon compound having at least one tertiary carbon atom or quaternary carbon atom. 
     
     
         2 . The initiator composition for a fluorinated polymer according to  claim 1 , wherein the saturated hydrocarbon compound has from 6 to 15 carbon atoms. 
     
     
         3 . The initiator composition for a fluorinated polymer according to  claim 1 , wherein the number of chained methylene groups in the saturated hydrocarbon compound is less than 3. 
     
     
         4 . The initiator composition for a fluorinated polymer according to  claim 1 , wherein the saturated hydrocarbon compound has a boiling point of from 40 to 250° C. 
     
     
         5 . The initiator composition for a fluorinated polymer according to  claim 1 , wherein the saturated hydrocarbon compound has a melting point of from −100 to 0° C. 
     
     
         6 . The initiator composition for a fluorinated polymer according to  claim 1 , wherein the saturated hydrocarbon compound is 2,2,4,6,6-pentamethylheptane. 
     
     
         7 . The initiator composition for a fluorinated polymer according to  claim 1 , wherein the 10 hour half-life temperature of the organic peroxide is from 10 to 150° C. 
     
     
         8 . The initiator composition for a fluorinated polymer according to  claim 1 , wherein the organic peroxide is t-butyl peroxypivalate. 
     
     
         9 . A method for producing a fluorinated polymer by using the initiator composition for a dluorinated polymer as defined in  claim 1 . 
     
     
         10 . The method for producing a fluorinated polymer according to  claim 9 , wherein the fluorinated polymer is a tetrafluoroethylene polymer, a vinylidene fluoride polymer, a chlorotrifluoroethylene polymer, a tetrafluoroethylene/hexafluoropropylene copolymer, a tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer, an ethylene/tetrafluoroethylene copolymer or an ethylene/chlorotrifluoroethylene copolymer. 
     
     
         11 . The method for producing a fluorinated polymer according to  claim 9 , wherein polymerization for the fluorinated polymer is solution polymerization or suspension polymerization. 
     
     
         12 . The method for producing a fluorinated polymer according to  claim 9 , which comprises a step of recovering a polymerization solvent and a step of separating the saturated hydrocarbon compound from the recovered polymerization solvent.